Shared source that becomes truly open source after 5 years. This means that if the company managing the source code does really poorly someone else can fork it

Shared source that becomes truly open source after 5 years. This means that if the company managing the source code does really poorly someone else can fork it commercially, but only the version from 5 years ago. This protects users in the cases the managing company goes out of business, or goes evil, but still lets them put in arbitrary commercial restrictions.